SPATIAL LIGHT MODULATORS

Origin and characteristics of ambiguous properties in measuring physical parameters of twisted nematic liquid crystal spatial light modulators

[+] Author Affiliations
Makoto Yamauchi

Research Center for Advanced Manufacturing on Nanoscale Science and Engineering, AIST, 1-2-1 Namiki, Tsukuba, Ibaraki 305-8564, Japan E-mail: m.yamauchi@aist.go.jp

Opt. Eng. 41(5), 1134-1141 (May 01, 2002). doi:10.1117/1.1466851
History: Received July 9, 2001; Accepted Nov. 29, 2001; Online April 26, 2002
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Twisted nematic liquid crystal spatial light modulators have been widely used for such applications as optical information processing and real-time holography. It is important to experimentally determine the physical parameters of the modulators to control their modulation characteristics. The parameters are usually calculated from a set of measured intensity transmittances. We mathematically prove that the calculation always suffers from ambiguities, and there exist two distinct origins. Neglecting absolute phase is one source of ambiguity; the other relates to the quasisinusoidal dependence of the complex amplitude transmittance on the parameters. Jones matrix formalism is used to analyze the ambiguity, and interesting examples are presented. © 2002 Society of Photo-Optical Instrumentation Engineers.

© 2002 Society of Photo-Optical Instrumentation Engineers

Citation

Makoto Yamauchi
"Origin and characteristics of ambiguous properties in measuring physical parameters of twisted nematic liquid crystal spatial light modulators", Opt. Eng. 41(5), 1134-1141 (May 01, 2002). ; http://dx.doi.org/10.1117/1.1466851


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